Metal file



Patented Mar. 18, 1930 UNITED r'rs LANroUs r. Een, or ANAconnA, MONTANA,Assrenon on cnn-HALF To PAUL Knrsxov, on A1\:fAco1\n3A,Y MONTANA Y METALFrLn Application led January 3, 1927. Serial No. 158,682.

This invention relates to a metal Working tool, of the nature of a file,consisting of a hardened metal body provided on its surface with finegrooves or ribs forming cutting teeth.

The invention aims to increase the efflciency and expedite the action oftools of the character indicated and prolong their period of service andwith these ends in View and such others as result from the improvement,the invention consists of a iile having the corner at the intersectionof adjacent faces notched to provide teeth and interspaced gullets, andhaving the face channeled and the line teeth checked.

vWhile the drawings illustrate a preferred embodiment of the invention,it is to be understood that in adapting the means to meet specific needsand requirements the design 2o may be varied and such other changes inthe minor details of construction may be resorted to within the scope ofthe invention as claimed, without departing from the spirit thereof.

For a full understanding of the invention and the merits thereof,reference is to be had to the following description and the drawingshereto attached, in which,-

Figure 1 is a plan View of a three-cornered so tile embodying theinvention.

Figure 2 is a detail sectional view on the line 2-2 of Figure 1.

Figure 3 is an edge view of a fiat tile embodying the invention.

Figure 4 is a side view of the flat ile.

Figure 5 is a detail sectional view on the line 5 5 of Figure 4. y

Corresponding and like parts are referred to in the followingdescription and designated in the several views of the drawings by likereference characters.

The three-cornered le illustrated in Figures 1 and 2 has its threesides, or faces finely grooved to provide the usual cutting edges, andin accordance with the invention, the three corners are notched, asindicated at 10, to provide coarse teeth, and interspacing gullets,which provide clearance for the cuttings. This same feature is appliedin other styles of files, whether square, flat, or half round,

the corner at the intersection of adjacent faces, or sides, beingnotched, as indicated at 10 to provide coarse cutting teeth. The sidesof the notches may be` disposed at any relative angle, according to thedesired formation of the teeth to thus adapt the file to a` particularwork.

Another feature resides in channeling the face or side of the file, asindicated most clearly in Figure 1. rangement a main channel ll extendslengthwise of the lile and may be of any outline in cross section.Thelongitudinally disposed channel l1 has a Zig-Zag arrangement and isdisposed medially of the file, whereby to uniformly divide the teethcomprising the cutting face. The teeth 12 upon one side of the channel11 incline in an opposite vdirection to the teeth 13 upon the oppositeside of the channel. The two sets of teeth 12 and 13 are similarlyinclined in reverse order, thereby preventing side draft in the actionof the file when in service. The teethv 12 and 13 are checked, asindicated at 14, to increase the cutting action of the file and to breakupthread-lile cuttings. Lateral channels 15 project from the mainchannel l1 and inoline in opposition thereto, and extend through theouter opposite faces of the file. The channels provide in effectclearance passages for the rapid discharge of the cuttings, which arethus prevented from interfering with the rapid action of the ile. In thecase of Hat files, one edge may be plain, but the corners are notchedand the opposite edge is milled or nely grooved to provide the usualcutting teeth, and in addition the corners are notched to provide coarsecutting teeth. The broad faces or sides of the file may be channeled,and the usual line cutting teeth are divided by the longitudinallydisposed In the preferable ar-y channel, and the teeth upon one side ofthe Y longitudinal channel incline in an opposite i" direction to theteeth upon the opposite side of the channel. A file embodying theinvention is rapid in action, smooth cutting and partly free fromtendency to side-draft.

Having thus described the invention, I claim:

teeth extending across the same and coarsel cutting teeth on the cornersintersecting the finer teeth. .A

l2. A le having fine teeth, and having the corners notehedjto `providecorser -cuttingteeth and interspae- *i ing gullets, the inerteethextending across the faces and Opening into the gullets."VA n 'l Intestimony Whereofl ax my signature.V

its 'faces providedwifith: y

